Reload wallpaper when display configuration changes.

ash/default_user_wallpaper_delegate.cc

Index: ash/default_user_wallpaper_delegate.cc
diff --git a/ash/default_user_wallpaper_delegate.cc b/ash/default_user_wallpaper_delegate.cc
new file mode 100644
index 0000000000000000000000000000000000000000..168fc9d45225398be2220baf1831196f5fb4d7e9
--- /dev/null
+++ b/ash/default_user_wallpaper_delegate.cc
@@ -0,0 +1,41 @@
+// Copyright 2013 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "ash/default_user_wallpaper_delegate.h"
+
+#include "ash/desktop_background/desktop_background_controller.h"
+#include "ash/shell.h"
+
+namespace ash {
+
+int DefaultUserWallpaperDelegate::GetAnimationType() {
+  return views::corewm::WINDOW_VISIBILITY_ANIMATION_TYPE_FADE;
+}
+
+bool DefaultUserWallpaperDelegate::ShouldShowInitialAnimation() {
+  return false;
+}
+
+void DefaultUserWallpaperDelegate::UpdateWallpaper() {
+}
+
+void DefaultUserWallpaperDelegate::InitializeWallpaper() {
+  ash::Shell::GetInstance()->desktop_background_controller()->
+      CreateEmptyWallpaper();
+}
+
+void DefaultUserWallpaperDelegate::OpenSetWallpaperPage() {
+}
+
+bool DefaultUserWallpaperDelegate::CanOpenSetWallpaperPage() {
+  return false;
+}
+
+void DefaultUserWallpaperDelegate::OnWallpaperAnimationFinished() {
+}
+
+void DefaultUserWallpaperDelegate::OnWallpaperBootAnimationFinished() {
+}
+
+}  // namespace ash